testbed is now functional

I would like to make sure some _ tests are
passing, however I have to think of a nice
way to grab debug output and compare it
nicely.  Some require NReg == 3, that is a
pain in the ass.  Maybe they can be changed
to work for the full register set.

lisc/test/_spill3.ssa

@@ -0,0 +1,24 @@
+# make sure comparisons
+# never get their two
+# operands in memory
+# run with NReg == 3, or
+# adapt it!
+
+function $test() {
+@start
+	%a =w loadw $a
+	%b =w loadw $a
+
+@loop
+	%c =w phi @start 0, @loop %f
+	%d =w phi @start 0, @loop %g
+	%e =w phi @start 0, @loop %h
+	%f =w add %c, %d
+	%g =w add %c, %e
+	%h =w add %e, %d
+	%x =w cslew %a, %b
+	jnz %x, @loop, @end
+
+@end
+	ret
+}